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Communication Dans Un Congrès Année : 2024

Atomic-scale structural analysis of metastable zirconia

Résumé

Phases that exist beyond their thermodynamic fields of stability are important to emerging technologies. Metastable phases are prevalent in far-from-equilibrium processing approaches and often exhibit desirable chemical and physical properties. However, there is limited understanding of the atomic-scale structural mechanisms that allow metastable phases to be recovered to ambient conditions. Metastability plays an important role in the synthesis of different zirconia (ZrO2) polymorphs. We utilized a state-of-the-art analytical approach with neutrons from the world’s most intense pulsed neutron source to investigate the atomic-scale recovery process and the structural properties of the metastable tetragonal phase. Grain-size reduction to the nanometer range and bombardment with high-energy (GeV) ions were used to prepare this metastable form of zirconia. We show in this presentation that the formation of a hierarchical network of nanoscale domains of lower symmetry, separated by domain walls, is the underlying structural mechanism that provides the pathway to the metastable state.
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Dates et versions

hal-04563459 , version 1 (29-04-2024)

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Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : hal-04563459 , version 1

Citer

Maik Lang, Alexandre P. Solomon, Eric C. O'Quinn, Gianguido Baldinozzi, Liu Juejing, et al.. Atomic-scale structural analysis of metastable zirconia. The Materials Science & Technology (MS&T24) meeting, Oct 2024, Pittsburg, United States. ⟨hal-04563459⟩
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